While working at the US I learned this very useful word, "to buzz somebody in". It means that you press the button which remotely opens the front door of your house, and as long as the person waiting outside hears the buzzing of the marget that unlocks the door he or she can enter.
So, it is quite common to ask somebody "to buzz you in", especially while standing in front of the door on a cold day -- "Hey, Max, this is me, Alexander, can you buzz me in"? :)
I have never heard any similar word in German.